Association for the Study of Negro Life and History Director (1950-51)Association for the Study of Negro Life and History Asst. to Director (1932-33)Alpha Phi Alpha FraternityNAACP Advisor, International AffairsSpingarn Medal 1980

Author of books:The Diplomatic Relations of the United States with Haiti, 1776-1891 (1941)The Operation of the Mandate System in Africa, 1919-1927 (1942)The African Mandates in World Politics (1949)The Negro in American Life and Thought: The Nadir, 1877-1901 (1965)The Negro in the United States: A Brief History (1957)Haiti and the Dominican Republic (1968)Howard University: The First Hundred Years, 1867-1967 (1969)W. E. B. Du Bois: A Profile (1971)